Six-cylinder crank throw arrangement



Feb. 10, 1948. DAVEY 1 v 2,435,874

SIX-CYLINDER CRANK THROW ARRANGEMENT Filed July 25, 1946 2 Sheets-Sheet 1 FIG-l INVENTOR. PAUL H. DAVEY BY 4504, 2%,, Wflu ATTORNEYS Feb. 10, 1948. P. H. DAVEY 2,435,874

SIX-CYLINDER CRANK THROW ARRANGEMENT Fi y 1946 2 Sheets-Sheet? INVENTOR PAUL H. DAVEY M 710;, M mam ATTORNEYS Patented Feb. 10, 1948 UNITED STATES PATENT OFFICE SIX-CYLINDER CRANK 'rnnow ARRANGEMENT Paul H. Davey. Kent, Ohio Application July 25, 1946, Scrial No. 686,192

3.Glaims.

. 1 This invention relates to improvements in a six cylinder crank throw arrangement for use in connection with compressors, pumps, internal combustion engines, and the like.

An object of the present invention is to provide such 'an' arrangement of six cylinders and the crankshaft connected with the same that space is greatly conservedand vibration is reducedto a minimum.

' Other advantages will appear from the details of constructing the device so as to serve the major purpose pointed out above, and the essential features will be set forth in the appended claims. g

In the drawings,

Fig. 1 is a centralsectional view taken substantially along the line I-'I of Fig. 2;

7 Fig.2 is a top plan view of the device of Fig; 1; Fig. 3 is an end elevation of the same; while Figs. 4 to 9 inclusive, are diagrammatic views illustrating the var ous positions of the pistons,

connecting rods and crank throws.

I have chosen to illustrate my invention as applied to an air compressor, although those skilled in this art will understand that the principles disclosed are equally applicable to a pump or internal combustion engine. I shall therefore describe my invention as applied to the cylinders, connecting rods and crank throws of a compressor. without in any way limiting the application of the principles disclosed to other types of engines and pumps.

Referring to the various views, and regarding the right-hand end of Figs. 1 and 2 as the front end, the cylinders are arranged in two banks of three each, the first bank comprising cylinder I, whose axis is inclined toward the left (as viewed in Fig. 3) at an angle of sixty degrees from the vertical, cylinder 2, whose axis is inclined toward the right at sixty degrees from the vertical, and cylinder 3, whose axis is vertical. In the second bank, cylinder 4 is inclined toward the left in line with cylinder I, cylinder 5 is inclined toward the right in line with cylinder 2, and cylinder 6 is vertical in line with cylinder 3. In

- the case of a compressor, cylinders I, 2, 4 and 5 are low pressure and deliver air to an intercooler (not shown) from which the air flows to high pressure cylinders 3 and 6. The crankshaft 'I is mounted in suitable bearings in crankcase 8. The shaft has two throws 9 and III in line with each other and a throw II one hundred and eighty degrees around the crank circle from 9 and III. The connecting rods Ia and 20: respectively, are connected with the pistons lb and 2b 5 cylinders 4, 5 and 6 respectively. These three connecting rods are journaled on the crank throw II; The connecting rod So has the usual wrist.

pin connection with piston 6b which in turn reeiprocates in cylinder 6. The connecting rod 6a i is journaled on the crank throw III.

Referring to Figs. 1 and 2, it will be noted that each cylinder is positioned to the rear of the cylinder forwardly thereof, just sufficiently to permit the connection of the associated connecting l rods to the crankshaft. Cylinders I and 2 have their axes lying in planes separated longitudinally of the crankcase only approximately the width of the connecting rod bearing on the crankshaft. or of the order of an inch or an inch and a half apart. Cylinder 3 is to the rear of cylinder 2 just sufiiciently to permit cylinder 4 to clear cylinder I. Cylinders 3, 4 and 5' are separated by approximately the same distance as cylinders I and 2, namely, just sufficiently to permit the connection of their rods side by side -on the crank throw II, as clearly shown in Fig.

1. Cylinder 6 is to the rear of cylinder 5 just sufficiently to permit the placing of cylinder 6 directly in rear of cylinder 3. The valves, connecting piping. intercoolers,

and the like, have been omitted from the views so as to more clearly explain the invention involved.

In Figs. 4 to 9, I have shown diagrammatically various positions of the parts as the crankshaft changes position. For clearness, the first and second banks have been separated in each view, and the crank throw II has been shown in connection with the two different banks with the dot-dash lines II' connecting the two parts of the diagram to indicate that there is really but one throw II. For instance, referring to Fig. 4,

it will be noted that connecting rods Ia and 2a are journaled on the crank throw 9 as previously described. The connecting rods 3a, 4a

and 5a are journaled on the crank throw II,

and the connecting rod 6a is journaled on the crank throw III. This arrangement has been followed throughout the diagrams.

In Fig. 4, piston 61) has reached the uppermost point in its stroke. In Fig. 5, the crank has rotated sixty degrees, and piston 21) has reached the uppermost point of its stroke. In like fashion, Figs. 6, 7, 8 and 9 illustrate step by 65 step movement of the crank throws around the crank circle by progressive steps of sixty degrees each, and the pistons reach the uppermost point of their strokes as follows. Piston 4b in Fig. 6, piston 31) in Fig. 7, piston 51) in Fig. 8 and piston lb in Fig. 9. It will be noticed from the above that this firing order of 1, 6, 2, 4, 3, 5, gives the minimum oscillation endwise of the crankshaft, it gives one piston reaching the top of its stroke every sixty degrees of crank movement, and it gives a minimum of side to side oscillation inasmuch as cylinder I is on the left side, 6 is in the center, 2 is on the right side, 4 is on the left side, 3 is in the center, and is on the right side.

It results from the above construction that there is a very even flow of power and a. minimum of vibration even at high speeds. In addition, the cylinders take up much less room than other six cylinder arrangements known tome.

While I have described the above device as a compressor, which would normally be operated by attaching a source of power, not shown, to the right-hand end of crankshaft l as shown in Figs. 1 and 2, nevertheless, it will be understood that the cylinders might be provided with chargeforming means and. charge-exploding means so as to provide an internal combustion engine which would deliver power to the shaft 1. In either case, there would be an even flow of power and a minimum of vibration provided by means of my invention.

What I claim is:

1. In combination, a crankcase, a crankshaft journaled therein and extending longitudinally thereof, said shaft having first and third throws spaced longitudinally of said shaft, said first and third throws being axially aligned, said shaft having a second throw intermediate said first and third throws and one hundred and eighty degrees around the crank circle from them, first and second cylinders having axes inclined at angles of approximately sixty degrees respective ly left and right from the vertical, a third cylinder having its axis vertical, fourth and fifth cylinders having axes inclined at angles of approximatelysixty degrees respectively left and right from the vertical, a sixth cylinder having its axis vertical, a reciprocable piston in each of said cylinders, and connecting rods for connecting the pistons of said first and second cylinders with said first throw, for connecting the pistons of said third, fourth and fifth cylinders with said second throw, and for connecting the piston of said sixth cylinder with said third throw.

2. The combination of claim 1 wherein said first, second and third cylinders respectively lie closely adjacent said fourth, fifth and sixth cylinders, said first and second cylinders are spaced axially not substantially more than that necessary to connect their connecting rods side by side on a crank throw, and said third, fourth and fifth .cylinders are spaced axially not substantially more than that necessary to connect their connecting rods side by side on a crank throw.

3. The combination of claim 1 wherein said first, second, fourth and fifth cylinders are low pressure compressor units for feeding compressed gas to said third and sixth cylinders for higher compression.

PAUL H. DAVEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Switzerland 1925 

